If the quality and documentation of the radio part is anything like their "blue nrg" parts, watch out! We had to develop a product with one of these at my last job and I vowed to stick with Nordic in the future if I have any say in the matter.
I'm also curious if the radio registers are documented at the lowest level, allowing a creative hacker to do anything that the radio hardware is physically capable of, or if it is just like everyone else's wireless SoC where the radio-control core is off-limits to developers and the only access is through a corporate-provided API. This is the only thing which would tempt me to give these a closer look. For example, I think it would be neat if someone developed an open-source LoRa modem for non-Semtech silicon. That way the SoC maker is off the hook for the IP violation because all they did was provide the radio and a nice register interface.